Indicators of an author

With the plot parameter, the Author products endpoint returns an indicator instead of the product list.

GET /person/{person_id}/research/products?plot=<indicator>

Indicators accept the same filters as the product list.

Indicator	`plot` value	Chart
Annual evolution by ImpactU classification	`annual_evolution_by_impactu_classification`	Bar
Citations per year	`annual_citation_count`	Bar
Annual APC expenses	`annual_apc_expenses`	Bar
Open access articles per year	`annual_articles_open_access`	Bar
Articles per year from the top publishers	`annual_articles_by_top_publishers`	Bar
Most used words in titles	`most_used_title_words`	Pie
Articles by publisher	`articles_by_publisher`	Pie
Products by subject area	`products_by_subject`	Pie
Products by database	`products_by_database`	Venn diagram
Articles by access route	`articles_by_access_route`	Pie
Articles by Scienti category	`articles_by_scienti_category`	Pie
Articles by Scimago quartile	`articles_by_scimago_quartile`	Pie
Articles by publishing institution	`articles_by_publishing_institution`	Pie
Co-authorship by country	`coauthorship_by_country_map`	Map
Co-authorship by Colombian department	`coauthorship_by_colombian_department_map`	Map
Author co-authorship network	`author_coauthorship_network`	Network